Machine tool



y 21, 1940- E. E. KELLEY 4 2,201,182

MACHINE TOOL Filed Alig. 23, 1958 4 Sheets-Shet l E Q a i o x v Q Q Q; I$0 0 o J E Q I Q Q E E E q W R Q Z/VVENTOR E/merf/(ely I B ila ArrowL'E'Y E. E. KELLEY MACHINE TOOL May 21, 1940.

Fi1edug. 23, 1958 4 Sheets-Sheet 2 INVENTOR E/mer f. Kel/ E. E. KELLEYMay 21, 1940.

MACHINE TOOL Filed Aug. 23, 19158 4 Sheets-Sheet 3 j/v VENTOK, Elmer E.KeZ/P May 21, 1940. E. E. KELLEY MACHINE TOOL Filed Aug. 2:, 1958 4Sheets-Sheet 4 73 75 I /rrn IN VE/Y TOR. EZZer E/(gZ/g 5) 4/ PatentedMay 21, 1940 UNITED STATES PATENT OFFICE 42 Claims.

This invention relates to metal working machines of the kind generallyknown-as automatic screw machines.

Among the general objects of the invention are to provide an improvedmachine of this character, particularly adapted for forming turned metalarticles at a higher rate of production than heretofore attainable, andcapable of accomplishing like operations, or a number of differentoperations, simultaneously on each work piece; and to provide animproved multiple spindle machine capable of producing a completedarticle on each work spindle for every cycle of operation thereof in animproved manner.

A further object of my invention is to provide an improved machine ofthe type comprising two more work rotating spindles, each includingmeans for gripping the work during the tool op- ..ration and means forfeeding the work stock forward to advance a new work piece into the toolregion, the machine also including a stop element cooperating with thework feeding means to determine the length of stock to be fed; it beinga further object to provide improved means for actuating this stopelement between effective and ineffective positions.

Another object is to provide an improved automatic machine in which thetools moving transversely of the work spindles, such as forming and/orcutting-off tools, are supported on and presented to the Work by acommon carrier or tool slide and in which the arrangement of thetransversely operable tools is so improved that the respective tools ofany work spindle may operate alternately on the work to thereby assure alonger tool life, such arrangement having a further inherent advantageof permitting a relatively slow speed for the tools notwithstanding thehigh speed operation of the machine.

' A further object is to provide such an im proved machine havingaccommodation for other tools operating axially or endwise on the work,such, for example, as boring, threading or finishing tools, the tool ortools of the respective spindles being operable simultaneously in animproved manner and supported and presented to the work on a commoncarrier in an improved manner, and actuated in harmony with thetransverse tool carrier, so as to accomplish alloperations on the workpiece in an improved manner substantially at the same time, and thusproduce finished articles usually requiring a series of successiveoperations in an appreciably shorter time.

The invention has for a further object, the

provision of an improved machine adapted for the operation of the Wellknown self-opening threading die, the machine affording improvedautomatic feeding of the die to the work, as well as improved meanswhereby the die may be automatically manipulated to open or close thesame at the desired time intervals. A further object of'the invention isto provide an improved machine for the operation of improved dies havingchasers controlled in a manner to cut tapering threads as for pipejoints, or to cut oppositely tapering threads'in one operation as forpipe nipples; in either instance the machine affording complete andautomatic actuation of the controlling elements of the die. Stillfurther objects of my invention are to provide improved actuatingmechanism and improved controlling mechanism for the several mechanismsof the machine whereby these latter mechanisms are enabled to cooperatein an improved and effective manner.

These and other objects and advantages will hereinafter more fullyappear.

In the accompanying drawings, I have shown for purposes of illustration,two embodiments which my invention may assume in practice.

In these drawings:

Figure 1 is a side elevational view of the machine embodying one form ofthe invention, portions of the machine base being broken away;

Fig. 2 is a fragmentary plan view of the machine as shown in Figure 1,certain of the parts being shown in section to facilitate illustration;

Fig. 3 is a longitudinal central section through the machine, taken online 33 of Figure 2, certain of the parts being shown in elevation;

Fig. 4 is a transverse sectional view taken on line 4-4 of Figure 2 andillustrating the transverse tool slide;

Fig. '5 is a transverse sectional view taken on line 55 of Figure 2 andshowing the longitudinal tool carrier; g

Fig. 6 is a developed plan view of the cam drum for actuating the workgripping and feeding means of the spindles;

Fig. 7 is a fragmentary perspective view showing portions of themechanism for operating the stock stop arm, the slide block being turnedupward to facilitate illustration;

. Fig. 8 is a perspective view of the improved combination tool;

Fig. 9 is a fragmentaryplan view illustrating a modified form of theinvention, the embodiment herein being adapted for the application ofself opening threading dies' to thework';

Fig. 10 is a fragmentary side elevational view of the machine shown inFigure 9;

Fig. 11 is a transverse sectional view taken on the staggered line ofFigure 9;

Fig. 12 is an elevation of the chaser end of the threading die;

Fig. 13 is a detail perspective view of the controlling cam for thethreading die;

Figs. 14 and 15 are diagrammatic plan views.

illustrating, respectively, successive stages of operation of the toolson the work of a single spindle in accordance with the embodiment of theinvention shown in Figures 1 to 8, and

Figs. 16 and 1'7 are views similar, respectively, to Figures 14 and 15,but illustrating the successive stages of operation on the form of themachine shown in Figures 9 to 13.

Each embodiment of the invention illustrated herein may assume thegeneral arrangement shown and described in my prior Patent No.1,892,239, issued December 27, 1932, to which reference is had forcertain of the mechanism employed in the organization of the present Iinvention.

Referring first to the illustrative construction shown in Figures 1 to8, inclusive, the-machine comprises generally a main drive unit or gearbox 2!! and a head stock 2|, on which is mounted a plurality, herein apair, of work rotating and feeding spindles 22; the work carried bythese spindles being operated upon by tools supported in a transverselymovable tool slide 23, and by other tools carried on a longitudinallymovable tool carrier 24, the mentioned units being all supported on abase 25 in operative association with each other.

As shown more clearly in Figure 2, the work rotating spindles 22 are ofsimilar construction, and each includes means for gripping the workduring the tool operation thereon, and means for feeding the workforwardly at the completion of the tool operation to advance a newlength of stock into the tool region. The work gripping and feedingmeans of the spindles 22 is well.

known in the art, and, therefore, a brief description of same willsufiice to acquaint those skilled in the art with the cooperation ofthese devices in the present invention. The gripping of the work iseffected by a tubular collet 27, the tube portion of which extendsthroughout the spindle to cooperate with an operating mechanism 28therefor, actuated by a slidable cone including a collar 29. As shown inFigure 1, an arm mounted on a cam follower 35 engages the collar 29, thefollower 30 cooperating with cams on a cam drum 3| so that as the latteris rotated, the cone collar 29 is reciprocated to thereby actuate themechanism 28 and thus cause the collet 21 to grip or release the workstock therein during the desired time intervals. The mentioned workfeeding means includes a tube within the collet tube 21, the forward endof which includes spring fingers 33 which yieldably grip the work rod,the tube carrying these fingers extending beyond the collet tube andhaving at its free end a collar 34 engaged by an arm of a sliding member35, the latter being actuated by a cam follower 36, cooperating with asecond cam on the cam drum 3| so that as the latter is rotated theyieldable fingers 33 are' reciprocated in timed relation with theoperation of the collet 2! to thereby advance the work rod therein, allin a well known manner.

It will, of course, be noted that each work rotating spindle includes anouter tube 38 serving to rotate the work in cooperation with the collet21. Each outer tube 38 has a gear 39 secured thereon and in mesh with adriving gear 4|! car ried on a central shaft 4| extending longitudinallyof the machine and driven by the mechanism within the gear box 20 andfunctioning to rotate the work in each spindle 22 at a constant anduniform speed during operation of the machine,

In my improved machine, to attain the desired operation of the tools onthe transverse tool slide 23, as well as the tools on the longitudinallymoving tool carrier 24, it is desired that the work gripping and feedingmeans of each spindle be operated simultaneously. Accordingly, the camson the cam drum 3| for actuating these means, illustrated more clearlyin Figure 6, are arranged so that the collets 2'! of each spindle arecontracted and expanded simultaneously and likewise the yieldablefingers 23 of each spindle are reciprocated simultaneously, this mode ofoperation being effected by providing duplicate sets of cams 43, 44 foreach spindle on the cam drum 3|.

The cam drum 3| is carried on and driven by a shaft 45 journalled in thehead stock 2|, this shaft having a driven gear 46 in mesh with a drivegear 4'! carried on a central drive tube or hollow shaft 48 surroundingthe drive shaft 4|, the tube 48 extending also longitudinally of themachine and into the gear box 20, and driven by the mechanism within thegear box.

It will be seen that the central shaft 4| and the central tube 48function to drive all of the operating units of the machine, the shaft4| driving the spindles 22, and the tube 48 driving the work feeding andgripping mechanisms through the cam drum, 3|, and also driving thetransverse tool slide 23, the longitudinal tool slide 24, and a stockstop arm 5|! which cooperates with the work feeding mechanism todetermine the length of stock to be fed. The transverse tool slide 23,Figure 4, is actuated by a cam disc 5| carried on the shaft 45 andcooperating with a pair of rolls 52 on the tool slide to reciprocate thesame. The central tube 48 may be driven by any suitable mechanism withinthe gear box 2|], this mechanism being preferably similar to that shownand described in my aforesaid prior patent, a portion only of thismechanism being shown in Figure 3.

In a preferred construction, the central shaft 4| and the central tube48 are driven from a common source, such as an electric motor, notshown, the latter driving the gear box mechanism by a pulley 54, Figurel, the shaft of which is operatively connected to drive the centralshaft 4| and the central tube 48. The shaft 4| is also rotated at highspeed, and to effect the drive for the tube 48 at a relatively slowspeedby the same means, a suitable reduction gearing is employed, preferablythat illustrated in Figure 3, including a planetary gear system 55similar to that shown in my prior patent. A stationary gear 56 of acertain number of teeth is fixed to the casing of the gear box 20concentric with the tube 48, the latter having fixed thereon a secondgear 5'! of a different number of teeth than gear56. Both gears 56, 51have in mesh therewith a series of pinions 58 rotatably carried on aspider 59, the latter being journalled on the hub of gear 5'! and havingaifixed thereto a driven sprocket 60 actuated from the main drive, orshaft of the pulley 54. As the spider 59 is rotated, the pinions 58revolve in an orbit about the gears 55, 57 and, due to the difierentialnumber of teeth in these gears, a relatively slow rotation is'impartedto gear 51, to drive tube 48.

As shown, tube "48 drives the longitudinally movingtool carrier 24, thisdrive being effected by a camdrum t3 fixed on the tube 48 and having campads 64 cooperating with a roll 65 on the base of thetool carrier24.

The stock stop'arm '50 serves to determine the length of stock advancedby the feed mechanism of the spindles by abutting the ends of each stockrod as the same is fed forwardly from the spindles. During the feedingof the stock rods, the ends of-the arm 50 are in axial alignment withthe spindles, and, to permit the tools on the longitudinal tool carrier24 to be advanced to the work, the stock stop arm 50 is swung out ofefiective position to the position shown in Figure 5. Arm 5!] isadjustably carried in fixed position on a tube '68 surrounding androtatably mounted on the central tube 48. It is to be noted that tube 68terminates intermediate the gear boxand head stock 2!, at 69, therebeing a second tube ill contiguous therewith and also carriedon thecentral tube 48, the tube Hi serving as a support for certain elementshereinafter described. The swinging of the stock stop arm betweeneffective and ineffective positions is accomplished by a roll H mountedon the tube 68 and cooperating with a cam slot 12 of a slide block 13,the latter being slidable in a suitable supporting member 14 andreciprocable axially of the tube 68 by a connecting rod 15 afiixedthereto, and the latter having a roll 16 cooperating with a cam H on theinterior of the cam drum 63. The projecting portion of the connectingrod 15 is guided for sliding movement in a bracket I8 secured to thestationary tube 10, the bracket 18 including guide members l9 adjacenteach side of the roll 16 to guide the same in its reciprocatorymovement. Means are also provided to prevent rotation of member 14 abouttube 68 and thereby hold tube 70 non-rotative to maintain the positionof guide bracket 18, tube 70 being fixed in the member M as by a setscrew 80. For this purpose a sliding key connection between the member14 and the reciprocatory tool carrier 24 is provided in the form of akey 8! on member 14 riding in a corresponding slot-82 on the toolcarrier, see Figs. 3 and 5.

The tools on the tool carrier 24 include a series of tool holders 83,one for each work spindle 22, each adjustably secured on the carrier andadapted to support suitable tools, such as a drill 84 and cutter 85, forpresentation axially to the work rotated by each spindle. It will beobserved that each tool holder 83 may be adapted to support one or moreof various tools required to produce a certain article, it being notedthat a similar tool or set of tools is provided for operation on eachspindle of the machine. It is further noted that all of the tools movingaxially toward the work are carried on a common carrier, namely, thetool carrier 24, and accordingly all of these tools are presentedsimultaneously to the work of each spindle.

The relation of the cam 54, by which the longitudinally moving toolcarrier 24 is reciprocated, with the cam 11 for actuating the stock stoparm 50, is such that arm 50 has its ends in axial alignment with thespindles as the tool carrier 24 is in retracted position and, as thetool carrier 24 is advanced to present the tools 84, 85 to the work, thestock stop arm 50 is immediately swung to inefiectiveposition with theends thereof disposed out of thepath of the tools 84, 85.

As shown more clearly in Fig. 4, the transverse tool slide 23 carries apair of diametrically opposed tools 88, 89 for each spindle, these toolsbeing suitably supported as by a plurality of tool posts 90 mounted on alower member'Sl of the tool slide, and slidably retained on the bed 25of the machine as by guide ways 92. The tools 88, 89 are all adjustablycarried on the respective tool posts 90 so that adjustment of the toolsrelative to the work may be made as required.

With regard to the general cooperation of the tools on the transverseslide 23, with the tools on the longitudinal carrier 24, it may be herenoted that the tool carrier 24 is reciprocated once forward and backduring each cycle of the machine, whereas the transverse tool slide 23moves in only a single direction during each cycle of the machine, thereverse stroke of the transverse tool slide being had during thesucceeding cycle of the machine; that is, the tools 88 accomplish theirwork during one cycle and the tools 89 accomplish their work during asucceeding cycle, the tools 88, 89 thus operating alternately on thework of one spindle. able that such tools as 88, 89, being usuallyforming or cutting-off tools, or a combination of both, be fed to thework at a relatively slow speed, which speed is had due to the two cyclemode of operation of the transverse tool slide 23.

The tools 88, 89 are substantially alike in form, each tool beingadapted to accomplish a similar operation or group of operations. :Asshown more clearly in Fig. 8, the tools-8il, 89 may take the form ofcombined forming and cutting-off tools, the portion 93 being providedfor forming the periphery of the work, while theportion-M accomplishesthe cutting-01f operation.

Referring now to Figs. 14 and 15, the operation of the various tools ofthe machine, to produce a tubular article finished on all surfaces, willnow be described. The region in which the tools operate may be dividedinto two work stations designated by X and Y, it being noted-that thestock stop arm 50 is arranged to abut the work rod at the outermostlimit of the work station Y. Preliminary to starting the machine forwork on a new length of stock, the stock rod is projected from each workrotating spindle a distance ample to occupy the work station X only, asshown in Fig. 14, the work station Y being left void momentarily. Thedistance from the stock stop arm 50 to the end of the work rod atstation X may be gaged by a suitable spacer block used temporarily. Themachine may be turned over by hand employing a suitable crank, notshown, so that as power is turned on, the collets 21 of each spindlegrip the work. When power is applied to the machine, the tool 89, Figure14, is advanced to the blank work rod and forms the rod as shown,rounding each corner by the portions 93 of the tool and also trimmingthe end of the stock by the cutting-off portion 9d. The axiallyoperating tools -84, 85

are, during the operation of tool 89, moved toward the work but do notactually operate thereon, in that the work stock has not as yet beenadvanced into station Y, with the exception that the drill 84 cuts aslight bore in the end of the stock. As the machine continues tofunction, the tools 89, 84 and 85 are retracted, the latter tools beingfully retracted, but the tool 89 being backed halfway. It will, ofcourse, be noted that during retraction of tool 89, the opposite tool 88of the pair is being advanced.

- At this stage of operation, the work gripping and feeding means ofeach spindle functions so that the work rod including the partlyfinished work piece shown in Fig. 14, is advanced from station X tostation Y, as shown in Fig. 15, the end of the stock rod now abuttingthe stock stop arm 50. The collets 21 of the spindles now grip the workand tool 08 continues to advance from its intermediate advanced positionand, coming into engagement with the work, forms the blank stock atstation X. At the same time, the tools 84, 85 are advanced into stationY to completely finish the work by boring the work piece throughout andby taking a finishing cut from the periphery thereof. The operation oftools 84, 85 is so timed with reference to the operation of tool 88,that as tools 84, 85 are being retracted, the work piece in station Y issevered from the stock rod by the cutting-off portion 94 of tool 88. Atthis stage of operation, the work piece in station X is partiallycompleted as shown in Figure 14 and the machine continues to functionautomatically throughout successive cycles so that at each cycle ofoperation, a completed article is produced, it being noted that thecorresponding tools at each spindle of the machine are accomplishingidentical operations simultaneously and thereby produce a finishedarticle on each spindle during each complete cycle, or two articles percycle on a two spindle machine. It will, of course, be noted that onsuch jobs as do not require a boring or other axially applied operation,the tools 84, v05 may be omitted, in which instance, the tools 88, 89operate in the same manner as described.

Attention is now directed to Figs. 9 to 1'7, inclusive, for adescription of the modified form of the machine, it being noted thatthis form is particularly adapted for the production of threadedarticles, this form of machine employing an automatic threading die ofthe self-opening type by which the thread cutting chasers of the die,upon completion of the required length of the thread, are automaticallyopened or released from the work to permit the withdrawal of the entiredie therefrom. Such a die may produce straight threads as required onscrews or bolts, or a thread having a taper in one direction only as onthe usual pipe fitting.

The embodiment of the modified form of the machine illustrated herein,while being adapted for the control of the aforementioned well-knownself-opening die, is further adaptedfor the use of a specialself-opening die, shown herein, and of the type made by the Jones andLamson Co. No claim is made to this die, per se, in this application.This special die, while being equipped with the self-opening feature,also has an automatically operative chaser-adjusting device by whichthreads of double tapering form are produced, such as are required forpipe nipples, the device being mechanized so as to gradually expand thedie chasers during one-half of the threading operation, producing asingly tapered thread, and to thereafter contract the chasers for theremaining half of the threading operation, to produce an oppositelytapering thread on the final half of the work piece.

In the modified form, the machine presents substantially the samearrangement as in the first form described, same comprising generallythe gear box or main drive 20, the headstock 2I including the spindles22, the transverse tool slide 23 and the longitudinal tool carrier 24,all operating in substantially the same relationship. In the latterform, however, the longitudinal tool carrier 24 and the supportingmember 14 of the stock stop arm actuating mechanism are modified so asto be adapted for the control of the aforementioned threading dieindicated by numeral I00. The threading die I is mounted on the toolholder 83 in place of the tools 84, 85 of the first form.

The self-opening feature of the die is effected by movement of anaxially sliding collar IOI with which is engaged a yoke I02 slidablymounted on a threaded rod I03 supported by projecting arms of a crosshead I04 carried on the supporting member 14. During threading, the dieI00 is advanced to the work by movement of the tool carrier 24, Whichmovement is ample to produce a maximum desired length of thread. Themovement of collar IOI on the die to effect opening or closing of thedie chasers is relatively short and, accordingly, the yoke I02 assumes asliding idle movement on rod I03, the threads of which adjustably carrystops or nuts I05, I06 at each limit of movement to thereby adjust theextent of idle movement for the yoke in relation to the length of threadrequired.

The distance between stop I05 and the adjacent forward end of yoke I02represents the length of thread to be formed, it being noted that asyoke I02 engages stop I05, a further movement of die I00 causes thecollar I 0| to be retracted on the die and thereby opens the diechasers. Thus, the dies I00 are automaticaly advanced to the work, bythe means for actuating the tool carrier 24 and, as the desired lengthof thread is completed, the die is opened. The tool carrier then beginsits rearward movement, and with it the die, the chasers of which remainopen as the yoke I02 moves idly between the stops I05, I06. As the dieapproaches its rearmost position, the yoke I02 engages the stop I06 andthe die chasers will thereby close preparatory to a succeeding threadingoperation. The operation of the die I00 thus far described is had in thewell-known selfopening threading die to produce a non-tapering orstraight thread, or by substituting special tapered chasers to produce athread having a single taper.

Where a thread of a double taper, as for pipe close nipples, isrequired, the threading die may be provided with adjustment means forexpanding and contracting the die chasers in a manner to produce thedouble tapering thread, in addition to the above described meansrequired for opening thedies at the finish of the thread cuttingoperation and closing the dies when they have been moved axially totheir retracted position. In the present embodiment, the die chasers areadjusted to produce the reversely tapering thread during the threadcutting operation by a rotative movement of a sleeve I08 forming part ofthe die, this sleeve having a roll I09 projecting radially therefrom,see Figs. 11 and 12, in a cam groove IIO of a block III, see Fig. 13.This block is removably attached to a stationary part of the machine,preferably to the supporting member 14, and, being removable, may bereplaced by blocks having other cam grooves IIO to effect differenttapers forthe threads to be produced. As shown in Fig. 13, the camgroove IIO has an upwardly and a downwardly sloping portion, theseportions acting successively upon the roll I09 so that the die chasersare gradually expanded as the roll I09 rides up the cam groove I I0 toout one tapered thread, and the chasers are gradually contracted as theroll rides down the 7 further portion of the cam groove to cutthe rew instation X.

versely tapered thread.

While I have described in some detail the operation of the die IUD withparticular reference to the control of the die chasers, as beingselfopening by a reciprocatory movement of the collar and for taperthread control by a rotative movement of the sleeve I08, it will beobserved that the control of the die for either manipulation of the diechasers may be effected by any suitable movement of the particularcontrol element relative to the die, and, therefore,

the respective elements l0! and H18 may be regarded generally as diecontrolling elements. In this regard, it is also to be noted that mymachine in its modified form, provides means for autuating either thesliding control collar I!!! alone or both of these control elements Hi!and 38, depending upon the nature of the threading operation to beperformed. Where the operation required necessitates the use of a diehaving only the self-opening feature, a reciprocatory control elementalone may be used, in either instance the appropriate actuating meansfor same being provided substantially as disclosed. Further, where thedie required for a particular threading operation necessitates the useof both control elements, these elements may be actuated by the combinedmeans herein set forth.

Referring to Figs. 16 and 17, it will be noted that the operation of themodified form of the machine is substantially similar to that of thefirst form, a threading operation being performed, however, by thelongitudinally movable tool carrier .24. In the production of articlessuch as pipe nipples, the blank stock rod may be of tubular form,usually standard pipe, thereby obviating the need for a boringoperation. In setting up the machine to start operation, the blank tubeor pipe is projected from each of the spindles to occupy the firststation only, wherein station X, this being done in a manner similar tothat described for the first form. It. will be noted that the transversetool slide 23 carries tools similar to that of the first form, hereindesignated as tools 88, 89. As power is applied to the machine, the tool89 is advanced to the work to form same in the desired contour, hereinchamfering each end of the blank, after which tool 89 is retracted tothe intermediate position shown. During this operation the threading dieHill is advanced and retracted, the same idling through the work stationY for the initial cycle of the machine only. At this time, the grippingand feeding means for each spindle functions to advance the stock tubeso that the partly completed pipe nipple shown in Fig. 16 at station Xis now advanced to the station Y, a new blank being thereby disposed instation X, the stock stop arm: 50 functioning in. the manner similar toproved arrangement of the transversely operable retraction of tool 39,tool 88' is being advanced to the work and thus forms the new blank nowAt the same time the die. m0 is being advanced seats to complete thethreading operation on the partly finished article in station Y. Theoperation of the die Hill and the tools 83, 89' is so timed that as soonas the threading operation iscompleted the cutting-off portion 94 of thetool severs the finished pipe nipple from the tube stock. At the momentthe finished pipe nipple is severed, the work in station X is formed asshown in Fig. 16, whence the machine continues to function so as toadvance the stock tube, to complete the article by threading the partlycompleted work piece continuing theseoperations during successive cyclesof the machine. It is to be noted that also in the modified form, therespective tools, including the threading die, operate substantiallysimultaneously on the work of each spindle and thus a completed articleis produced on each spindle during each cycle of the machine.

It will be seen from the foregoing that my improved arrangement of thetranversely operable tools enables the machine to operate in an improvedmanner, in that the respective tools of each pair at a given spindle areadvanced alternately to accomplish corresponding operations onsuccessive Work pieces. That is, the use of two tools, or a pair oftools, at a given spindle affords a mode of operation in which first onetool operates on a first work piece to complete same, and then a secondtool comes into play on a second work piece while the first tool isbeing retracted; to thus produce two finished articles. Incontrast withthis mode of operation, machines of the type shown in my prior Patent#1,892,239 have the one tool of a given spindle, comparable with thesaid pair of tools, being reciprocated forth and back twice to producethe equivalent two work pieces. Thus, assuming that each machine isoperating at substantially the same speed, and each is tooled up toproduce a similar article, my improved machine is capable of aproduction twice that of the former mode of operation. My improved tooloperation, using the pair of tools, also has the important advantage ofpermitting a relatively slow tool feed, as compared with the. use of asingle tool only which requires that the tool be advanced slowly forproper cutting and be retracted rapidly to minimize the time peroperation. If the tool is retracted at the same slow speed at which itis advanced, a prolonged time for an operating cycle results. By thetool arrangement provided herein, adequate time is had for the advanceand retraction of the tools at the same relatively slow speed,notwithstanding a high speed operation of the machine; which conditionpermits of advancing the tools at an adequately slow speed to assure alonger tool life and a high quality of workmanship. This toolarrangement has the further salient advantage of enabling the use of acommon carrier for both tools of one spindle as well as for the pairs oftools ofall spindles, to assure a more accurate and uniform tool feedand also eifect appreciable economies in the initial cost of themachine.

The mode of operation of the various groups of tools of the machine,that is the transversely movabletools, as well as the longitudinallymovable tools, enables the machine to produce a finished article foreach cycle of operation, and as many such articles as there arework-rotating spindles on the machine. In that the longitudinallymovable tools operate in a work station beyond that in which thetransversely movable tools operate, the respective mentioned tools mayoperate substantially at the same time, to thus produce finishedarticles usually requiring a series of successive operations, in anappreciably shorter time.

Further, .it will be seen that I have, provided an improved mechanismfor actuating the stock stop arm between efiective and ineffectivepositions, this mechanism enabling the stop arm to beactuated inaccurate timedrelation with the longitudinally movable tool carrier,each of these elements being actuated by a common cam drum.

Thus, the stop arm may be swung from effective to ineffective positionduring the advancement of the axially operable tools, the coordinationof operation of the two mentioned elements being such that they may moveconcomitantly or immediately succeed each other, to thereby appreciablyminimize the total time fora complete cycle of operation.

It may be here noted that the first embodiment of my machine, by theaddition of several elements as herein illustrated, may be readilyadapted for the controlled operation of auto-' matic threading diestherein, certain elements of the machine in its first embodiment beingadapted to function in cooperation with other elements by which thevarious controls of the threading die may be positivelyand automaticallyeffected.

It will also be seen that I have provided, in a machine of thischaracter, improved means for actuating the control elements ofautomatic selfopening or taper threading dies, whereby accuratemanipulation of the die chasers is assured. In the second embodiment,the machine is adapted for actuating either a swingable control elementor an axially slidable control element of the automatic threading die,or may be equipped to operate both control elements in the instancewhere the die has both the self-opening feature and the chaser adjustingfeature for producing tapered threads. The means by which the slidablecontrol element of the die is actuated, is arranged so as to accommodatea greater axial movement of the die than is required to operate thecontrol element, this difference being compensated for by an adjustabledevice affording a variable limited idle movement of the control elementbefore same is actuated relative to the die, the adjustment featurepermitting any vari: ations in the lengths of thread required inpractice.

While I have in this application specifically described two forms whichmy invention may assume in practice, it will be understood that the sameis shown for purposes of illustration, and that my invention may bemodified and embodied in various other forms without departing from itsspirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a machine of the class described, a work rotating spindleincluding means for gripping and feeding the work therein, a pair oflike tools on opposed sides of said spindle, a single means operativelysupporting said tools and movable in fixed transverse planes, and meansfor actuating said tool supporting means in said planes to alternatelypresent a different tool of the pair to different successively fed workin said spindle following successive operations of said gripping andfeeding means. 7

2. In a machine of the class described, a work rotating spindleincluding automatic means for gripping and feeding the work therein, apair of like tools on opposed sides of said spindle, a single meansoperatively supporting said tools and movable in fixed transverseplanes, and means for actuating said tool supporting means in saidplanes to alternately present a different tool of said pair to differentsuccessively fed work in said spindle in timed relation with saidautomatic gripping and feeding means. i

3. In a machine of the classdescribed, a plurality of work rotatingspindles, each spindle including means for automatically gripping andfeeding the work therein, a pair of like tools on opposed sides of eachof said spindles, a single means operatively supporting said tools andmovable in fixed transverse planes, and means for actuating said toolsupporting means in said planes to alternately present a different toolof each pair simultaneously to different successively fed work of saidspindles following successive operations of said gripping and feedingmeans.

4. In a machine of the class described, a plurality of work rotatingspindles, each spindle in-'- cluding means for automatically grippingand feeding the work therein, a pair of like tools on opposed sides ofeach spindle, a tool slide slidable in fixed planes transversely to theaxes of said spindles and having means for operatively supporting saidtools, and means for actuating said tool slide in said planes toalternately present a different tool of each pair simultaneously todifferent successively fed work of said spindles following successiveoperations of said feeding and gripping means.

5. In a machine of the class described, a plurality of work rotatingspindles, each spindle inof work rotating spindles, each spindleincluding means for automatically gripping and feeding the work therein,a shaft axially parallel with said spindles, a first cam on said shaftfor operating said work gripping and feeding means, a pair of like toolson opposed sides of each spindle, a tool slide slidable in fixed planestransversely to the axes of said spindles and having means foroperatively supportingsaid tools, and a second cam on said shaft foractuating said tool slide in said planes to alternately present adifferent tool of each pair simultaneously to different successively fedwork of said spindles follow-. ing successive operations of saidgripping and feeding means.

7. In a machine of the class described, a pair of work spindlesrotatable on parallel longitudinal axes, mechanism for formingsimultaneously work rotated by both spindles and cutting off said worksimultaneously in both spindles including a tool slide movabletransversely of the axes of said spindles and carrying like toolsadapted to engage the work in both spindles as said slide is moved inone direction and means disposed be low said spindles and between thelatter for reciprocating said slide, and a driving member extendinglongitudinally of the machine between said spindles and driving saidforming and cutting off, mechanism.

8. In a machine of the class described, a pair of work spindlesrotatable on parallel longitudinal axes, a tool carrier movablelongitudinally of spindle and means disposed below said spindles andbetween the latter for reciprocating said slide to present both tools tothe work in their respective spindles simultaneously, and driving meansextending longitudinallyof the machine and between the axes of saidspindles for driving said tool carrier and forming and cutting offmechanism in synchronism.

9. In a machine of the class described, a plurality of work rotatingspindles, each spindle in eluding means for automatically gripping andfeeding the work therein, a stop mechanism adapted to cooperate withsaid feeding means to limit feeding of the work in said spindles andswingable to ineffective position, and means for swinging said stopmechanism in either direction between effective and ineffectivepositions including cooperating elements one carried by said stopmechanism and the other movable along the axis thereof.

10. In a machine of the class described, a pa r of work rotatingspindles, each spindle including means for automatically gripping andfeeding the work therein, work stop mechanism in cluding an oscillatorysleeve journalled in a plane between said spindles having a swingablestop arm adapted to cooperatewith said feeding means in each. spindle, aroll on said sleeve, a reciprocatory cam slot cooperating with saidroll, and means for actuating said cam slot to swing said stop armbetween effective and inefiective positions in timed relation with saidwork gripping and feeding means.

11. In a machine of the class described, a pair of work rotatingspindles, each spindle including means for automatically gripping andfeeding the work therein, a shaft parallel with and between saidspindles, a stop arm mounted for oscillatory movement about said shaftand having a roll movable about the letter, said stop arm being adaptedto cooperate with said feeding means to limit feeding of the work, and areciprocatory cam movable along said shaft and cooperating with saidroll to oscillate said arm between effective and ineffective positions.

12. In a machine of the class described, a pair of work rotatingspindles, each including means for automatically gripping and feedingthe work therein, cam means foractuatingsaid work gripping and feedingmeans, a shaft driving said cam means, a driving tube between saidspindles and extending longitudinally of the machine, drivingconnections between said tube and said cam shaft, a stop arm adapted tocooperate with said feeding means to limit feeding of the work in saidspindles, said arm being mounted to oscillate on said driving tube, andmeans actuated by said driving tube for oscillating said arm betweeneffective and ineffective positions.

13. In a machine of the class described, a plurality of work rotatingspindles, a tool slide movable transversely to the axes of saidspindles, cam means for reciprocating said tool slide including a camshaft, a drive shaft between said spindles and extending longitudinallyof the machine, driving connections between said drive shaft andspindles, a driving tube surrounding said drive shaft, drivingconnections between said driving tube and camshaft, a stop arm mountedto oscillate on said driving tube, and means driven from said drivingtube for oscillating said stop arm between effective and ineffectivepositions.

14. In a machine of the class described, a pair of workrotatingspindles, each spindle including means for automaticallygripping and feeding the work therein, a swingable stop arm pivotedbetween said spindles and' adapted to cooperate with said feeding meansto limit feeding of the work, a tool carrier movable to present toolsthereon axially to the work in said spindles, a cam and roll deviceoperatively associated with said stop arm, and means operableindependentlyof said carrier for reciprocating one member of said deviceto oscillate said stop arm with a positive ac-v tion in harmony with themovement of said tool carrier.

15. In a machine of the class described, a plurality of Work rotatingspindles, each spindle including means for automatically gripping andfeeding the work therein, a tool carrier movable to present toolsthereon axially to the work in said. spindles, a stop arm adapted tocooperate with said feeding means to limit the extent of feeding of thework and movable to ineffective position, cam means for actuating saidtool carrier, and. a second cam means for swinging said stop arm andoperable independently of the operation of said tool carrier.

16. In a machine of the class described, a pair of work rotating meanson parallel longitudinal axes, a tool slide movable transversely of bothsaid means, means for reciprocating said slide disposed below said workrotating means and between the latter, a driving member extendinglongitudinally of the machine between said work rotating means anddriving said slide reciprocating means, a tool carrier movablelongitudinally of the machine to present a tool thereon axially of saidwork rotating means, and means for actuating said tool carrierlongitudinally including an actuating member mounted on said drivingmember.

17. In a machine of the class described, a longitudinally extended bed,a headstock at one end of said bed having a hollow spindle, a gear boxat the other end of said bed having driving elements, means forautomatically feeding stock through said spindle and gripping the same,drive means extending from said gear box longitudinally of said bed andhaving driving elements separately connected to said work feeding meansand to said spindle, a tool carrier movable along said bed to and fromthe work gripped in said spindle, and means including an actuatingmember on one of said drive elements for effecting the aforesaidmovements of said tool carrier.

18. In a drive for a machine of the class described, a longitudinallyextended bed, a headstock at one end of said bed having a hollow spindlethrough which work stock is adapted to be fed, a gear box at the otherend of said bed having coaxial driving elements rotatable at high andlow speeds respectively, drive means extending from said gear boxlongitudinally of said bed and having coaxial high and low speed drivingmembers separately connected to said driving elements, a tool carriagemovable longitudinally of said bed to present a tool to the work in saidspindle, and cam means including an actuating element on said low speeddriving member for actuating said tool carriage longitudinally of saidbed.

19. In a machine of the class described, a plurality of work rotatingspindles, a drive shaft operatively connected to said spindle andextending longitudinally of the machine, a tool slide movabletransversely of said spindles, a shaft including a cam for reciprocatingsaid tool slide, a driving tube surrounding said spindle drive shaft andextending longitudinally of the machine, driving connections betweensaid camshaft and tube, a tool carrier movable longitudinally of themachine to present tools thereon axially of said spindles, and a cammounted on said driving tube and adapted to actuate said tool carrier.

20. In a machine of the class described, a pair of work rotatingspindles, each spindle including means for automatically gripping andfeeding the work therein, a drive shaft between said spindles extendinglongitudinally of the machine, a rotatable tube about said shaft andhaving a roll, a stop arm carried on said rotatable tube and adapted tocooperate with said work feeding means to limit the extent of feedingand swingable to ineffective position, a stationary member about saidshaft, reciprocatory cam means slidable in said stationary member andcooperating with said roll to swing said stop arm between effective andineffective positions, and means for actuating said cam means,

21. In a machine of the class described, a pair of work rotatingspindles, each spindle including means for automatically grippingandfeeding the work therein, a drive shaft between said spindles andextending longitudinally of the machine, a rotatable tube about saidshaft and having a roll, a stationary tube beyond said rotatable tubeand carried on said shaft, a stop arm carried on said rotatable tube andadapted to coop erate with said work feeding means to limit the extentof feeding and swingable to ineffective position, a support member fixedto said stationary tube, reciprocatory cam means slidable in saidsupport member and cooperating with said roll to swing said stop armbetween effective and ineffective positions, and means for actuatingsaid cam means.

22. In a machine of the class described, a pair of work rotatingspindles, each spindle including means for automatically gripping andfeeding the work therein, a drive shaft between said spindles andextending longitudinally of the machine, a rotatable tube about saidshaft and having a roll, a stationary tube beyond said rotatable tubeand carried on said shaft, a stop arm carried on said rotatable tube andadapted to cooperate with said work feeding means to limit the extent offeeding and swingable to ineffective position, a support member fixed tosaid stationary tube, reciprocatory cam means slidable in said supportmember and cooperating with said roll to swing said stop arm betweeneffective and ineffective positions, means for actuating said cam means,and a tool carrier slidable longitudinally of the machine, having asliding key connection between said support member and said toolcarrier.

23. In a machine of the class described, a pair of work rotatingspindles, each spindle including means for automatically gripping andfeeding the worktherein, a drive shaft between said spindles andextending longitudinally of the machine, a rotatable tube about saidshaft and having a roll, a stationary tube beyond said rotatable tubeand carried on said shaft, a stop arm carried on said rotatable tube andadapted to cooperate with said work feeding means to limit the extent offeeding and swingable to ineffective position, a support member fixed tosaid stationary tube, reciprocatory cam means slidable in said supportmember and cooperating with said roll to swing said stop arm betweeneffective and ineffective positions, means for actuating said cam meansincluding a connecting rod associated with said cam means, and a bracketcarried on said stationary tube for guiding said rod.

24. In a machine of the class described, a pair of work rotatingspindles, each spindle including means for automatically gripping andfeeding the work therein, a drive shaft between said spindles andextending longitudinally of the machine, a rotatable tube about saidshaft and having a roll, a stop arm carried on said rotatable tube andadapted to cooperate with said Work feeding means to limit the extent offeeding and swingable to ineffective position, reciprocatory cam meanscooperating with said roll to swing said stop arm between effective andineffective positions, and means for actuating said cam means movablealong the axis of said swinging stop member.

a 25. In a machine of the class described, a pair of work rotatingspindles, each spindle including means for automatically gripping andfeeding the work therein, a drive shaft between said spindles andextending longitudinally of the machine,

a rotatable tube about said shaft and having a roll, a stop arm carriedon said rotatable tube and adapted to cooperate with said work feedingmeans to limit the extent of feeding and swingable to ineffectiveposition, reciprocatory cam means cooperating with said roll to swingsaid stop arm between effective and ineffective positions, means foractuating said cam means, a tool carrier slidable longitudinally of themachine, and a cam drum including cams for actuating said tool carrierand said arm actuating cam.

26. In a machine of the class described, a pair of work rotatingspindles, each spindle including means for automatically gripping andfeeding the work therein, a stop arm adapted to cooperate with the workfeeding means of each spindle to limit the extent of feeding andswingable to ineffective position, an actuator for said stop arm, a toolcarrier movable longitudinally of the machine to present toolsthereonaxially to the work on said spindles, and means for actuating said toolcarrier and said stop arm actuator.

27. In a machine of the class described, a pair of work rotatingspindles, each spindle including means for automatically gripping andfeeding the work therein, a stop arm adapted to cooperate with the workfeeding means of each spindle to limit the extent of feeding andswingable to ineffective position, a stationary member carried on themachine, an actuator for said stop arm, a tool carrier movablelongitudinally of the ma chine to present tools thereon axially to thework on said spindles, means for actuating said tool carrier and saidstop arm actuator, and an automatic threading die mounted on said toolcarrier and having control elements for manipulat ing the die chasersthereof, said stationary member being disposed within the range oftravel of said tool carrier and having means cooperating with the diechaser control elements for actuating same incident to movement of saidtool carrier.

28. In a machine of the class described, the

combination with a work rotating spindle, of a threading die having acontrol element thereon reciprocable therewith and adapted to determinethe position of the chasers in said die, means mounting said die forreciprocatory movement relative to said work spindle, means foractuating said die mounting means to reciprocate said die and saidcontrol element thereon, and a member carried on the machine andengaging said reciprocatory element for effecting relative movementbetween said control element and said die.

29. In a machine of the class described, the combination with a workrotating spindle, of a ill threading: die having acontrol elementthereon reciprocable therewith andadaptedto determine the position ofthe chasersin said die, means mounting. said die for reciprocatorymovement relative torsaid'work spindle, means for actuating said. diemounting: means to reciprocate said die and saidcontrol element thereon,and a member engaging 'saidrecipro'catory element slidablycarried on themachine for limitediidle movement and. adapted, uponreaching the limits.of idle movement, to holdsaidcontrol-element and sheet relative movementbetween the latter and said die. during: further: movement of said die.

30. In amachine of the. class described,-.the combination with awo'rkrotating spindle, of a threading die havingacontrol element thereonrcciprocable. therewith and: adapted to determine the: position of thechasers in said die-means, mounting said. die for reciprocatory.movement relative to said work spindle, means for actuating said diemounting means to reciprocate said did andzrsaidcontrol element thereon,a memberem gaging said reciprocatory element slidably carried onthem'achine for limited idle movement and adapted, upon reaching thelimits of idle movement, to. holdsaid control element toeffect movementof. said die relative to said element dnringfurther movement of saiddie, and means for varying the limits of idle movement of said member, I

31. In a machine.ot'the. class described, the combination with a workrotating spindle, of a threading die having a control element thereonreciprocable therewith and adapted to determine the position of thechasers in said die, means mounting said die for reciprocatory movementrelative to said work spindle, means for actuating said die mountingmeans to reciprocate said die and said control element thereon, a sliderod fixed on the machine, a member engaging said reciprocable elementand slidable on said rod, and stops on said rod cooperating with saidmember to hold said reciprocable control element during further movementof said die, said stops being adjustable to vary the limits of slidingmovement of said member on said rod.

32. In a machine of the class described, the combination with a workrotating spindle, of a threading die having a control element rotatablethereon adapted to open or close the chasers of said die, means mountingsaid die for reciprocatory movement relative to said work spindle, meansfor actuating said die mounting means, means responsive'to reciprocatorymovement of said die for rotating said control element, and cut offmeans operableafter operation of said threading die and acting betweenthe latter and said spindles.

33. In a machine of the class described, the combination with a workrotating spindle, of a threading die having a control element rotatablethereon adapted to open or close the chasers of said die, means mountingsaid die for reciprocatory movement relative to said work spindle, meansfor actuating said die mounting means, eiiective upon reciprocatorymovement of said die to rotate said control element, and a transverselymovable tool slide having a cut off tool thereon acting on the work insaid spindle between the latter and said threading die.

34. In a machine of the class described, the combination with a workrotating spindle, of a threading die having a control element rotatablethereon adapted to open or close the chasers of said die, said controlelement including a roll,

35,111 amachine of the class described, the

combination with a work rotating spindle, of alongitudinallyreciprocable threading. die including means responsive tomovementof a first control element on saidsdie'relative to saiddie foropening or closing thechasers' thereof, means responsive" to movement ofasecond control element for: gradually expanding or contracting' theclosed diechasers;.means mounting said diefor reciprosato'ry movementrelative to said work spindle, meansifor actuating said die mountingmeans, and means. responsive to movement of said die for actuating saidfirst and second control elements;

3 6. In a machine 1' of the class described, the combination with a workrotating spindle, of a threading dieincluding a control elementslidableyon said die for opening or closing the chasers thereof, means.mounting said die for reciprocatory movement relative to said workspindle, a member slidably carried on the "machine for limited movementwith said die, engaging said slidable control element and adapted-uponreaching the limits of movement to hold said slidable control elementand effect relative movement between said die and element incident toreciprocatory movement of said die, said. die also including a rotatablecontrol element for gradually expanding and contracting said closedchasers having a follower, and a stationary cam on themachinecooperating with said follower to rotate said last named control elementincident to the reciprocatory movement of said die.

37. In a machine of the class described, in combination, a work rotatingspindle including means for automatically gripping and feeding the worktherein, a tool carrier movable en-dwise relative to said work spindle,a threading die on said tool carrier including a control element movablethereon for manipulating the chasers of said die, means responsive tomovement of said die for actuating said control element, and means foractuating said tool carrier to reciprocate said die and actuate saidcontrol element in harmony with the operation of said work gripping andfeeding means.

38. In a machine of the class described, a work rotating spindleincluding means for automatically gripping and feeding the work therein,a stop arm adapted to cooperate with said feeding means to limit theextent of feeding and swingable to ineffective position, a stationarymember, means for swinging said stop arm, a tool cally gripping andfeeding the work therein, a

stop arm adapted to cooperate with said feeding means to limit theextent of feeding and swingable to ineffective position, a stationarymem--' ber, means for swinging said stop arm, a tool carrier movableaxially of said spindles, a threading die carried on said tool carrier,said die including a slidable control element, and a yoke carried onsaid stationary member and engaging said control element for actuatingsame incident to movement of said die.-

40. In a machine of the class described, a work rotating spindleincluding means for automaticallygripping and feeding the work therein,a stop arm adapted to cooperate with said feeding means to limit theextent of feeding and swingable to ineffective position, a stationarymember, means for swinging said stop arm, a tool carrier movable axiallyof said spindles, a threading die carried onsaid tool carrier, said dieincluding a rotatable control element adapted to manipulate the chasersof said die and having a roll thereon, and a cam carried on saidstationary member and cooperating with said roll to rotate said controlelement incident to movement of spindles extending longitudinally of themachine, I

a rotatable tube about said shaft, a stop arm carried on said rotatabletube and positioned normally to cooperate with said work feeding meansto limit the extent of feeding and swingable to ineffective position, astationary member about said shaft, reciprocatory means for swingingsaid stop arm between effective and ineffective positions, a toolcarrier movable axially of said spindles, a pair of threading diescarried on said tool carrier, each of said dies including a slidablemember adapted to manipulate the chasers thereof, means for actuatingsaid slidable member relative to its die and incident to movement ofsaid dies and including a cross head carried on said stationary member,a slide rod for each die carried on said cross head, and a yoke slidableon each of said rods and operatively engaging said slidable member.ELNER. E. KELLEY.

CERTIFICATE OF CORRECTION. Patent No. 2,201,182. May '21, 191;0.

ELMER E. KELLEY.

It is hereby certified that error agpears in-the printed specificationof the above numbered patent requiring correction as follows: Page 5,first column, line LLl, for the word "wherein" read --herein--; line 61,strike out "proved arrangement of the transverself operable and insertinstead "that previously described. During the further--; line 614,after "time" insert a comma; and second column, line 1, after "piece"insert a comma;

page 7, second column, line 70, claim 19, for "spindle" read-spindles--;

and that the said Letters Patent should be read with this correctiontherein that the same may conform to the record of the'case in thePatent Office.

Signed and sealed this 27th day of August, A. D. 'l9liO.

Henry Van Arsdale,

(Seal) Acting Commissioner of latents.

